1001920 has 56 divisors (see below), whose sum is σ = 2487168. Its totient is φ = 384000.

The previous prime is 1001911. The next prime is 1001933. The reversal of 1001920 is 291001.

It is a hoax number, since the sum of its digits (13) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1001920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9870 + ... + 9970.

2^1001920 is an apocalyptic number.

1001920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1001920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1243584).

1001920 is an abundant number, since it is smaller than the sum of its proper divisors (1485248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1001920 is a wasteful number, since it uses less digits than its factorization.

1001920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1001920 is about 1000.9595396418. The cubic root of 1001920 is about 100.0639590836.

Adding to 1001920 its reverse (291001), we get a palindrome (1292921).

The spelling of 1001920 in words is "one million, one thousand, nine hundred twenty".